[DICRANELLA. Plant smaller than in _Dicranum_, and less robust, areolation rectangular at the base, in other respects similar.] LEUCOBRYUM (17). Caps., lid and peristome as in _Dicranum_. Leaves spongy, composed of a double layer of loose cellular tissue, white or pale glaucous green, sub-secund, nerve indistinct. 49. FISSIDENS (71). Caps. cernuous or erect, more or less truncate, teeth long and tapering from a lanceolate base, cleft half way into unequal segments, geniculate, barred; fruit in some species _cladocarpous_, leaves vertically distichous. 135. CERATODON (18). Caps. sub-cylindrical unequal, with a short ventricose or strumose neck; teeth deeply cleft, or of two equal subulate portions connected below by prominent trabeculæ, of two differently coloured laminæ, the outer red, the inner and broader yellow. 49. ‡ ‡ ‡ ‡ Capsule on an arcuate seta. CAMPYLOPUS (20). Caps. oval or oblong, regular or gibbous on upper side, tapering at base, striated, lid conico-subulate or rostrate, teeth deeply bifid; calyptra large, fringed at base; leaves with a broad nerve. 50. DICRANODONTIUM (19). Caps. elliptical smooth, teeth linear-lanceolate, cleft nearly to base into unequal portions, obliquely striate; calyptra not fringed at base. 49. * * * * Teeth 32, in pairs, narrow or filiform. DIDYMODON (25). Caps. erect, sub-cylindrical, teeth 32 (16 Wilson) linear-lanceolate, _not obviously united by a basilar membrane_, tender and fugacious, entire or perforate. 58. TRICHOSTOMUM (26). Caps. erect, sub-cylindrical or oval, smooth, teeth 32 in unequal pairs (often so united as to appear 16 simple or perforate teeth), connected by a narrow basilar membrane, persistent. 60. DISTICHIUM (24). Caps. as in last; teeth 32 (16 Wilson) not confluent at base, linear-lanceolate, entire, perforate or cleft, with a medial line; leaves _distichous_, setaceous from a sheathing base. 58. TORTULA (27). Caps. mostly erect ovate-oblong, smooth, teeth 32 very long filiform _twisted_, articulate papillose, outer cellules yellow, inner red, often united into a membrane at base; leaves not distichous. 63. CINCLIDOTUS (28). Caps. immersed ovate or oval, smooth, teeth 32 perfect or rudimentary, adhering at top to columella, contorted, anastomosing at base. 74. * * * * * Teeth 32 or 64 equidistant, short, obtuse, connected at apex by a tympanum, formed of dilated apex of columella; nerve of leaf covered with vertical lamellæ. † Caps. not angular.